unsalted butter, room temperature • granulated sugar • egg, room temperature • grounds almonds • cake flour or all-purpose flour, 75g (2.6 oz) each × 4 • (1 and 2/3 Tbsp) carrot powder • (1 and 2/3 Tbsp) burdock powder • (1 and 2/3 Tbsp) spinach powder • (1 and 2/3 Tbsp) purple sweet potato powder • ℃ / 338 F for 20 minutes • Preheating; 190℃ / 374 F